I cannot get Click2Call to "validate." I keep getting "Error 100." I have not be able to find any clues to solving this problem here. Vonage C/S says "Well, it works fine here."

I have a Linksys RTP300 behind a D-Link DI-624 plugged into a Motorola SB5120 on Comcast's 8Mbps service. This computer is plugged into the DI-624. Vonage has been running perfectly in every respect for close to two years on this setup. The RTP300's firmware is 5.01.04.

FWIW: House wiring is plugged into the RTP300. I can dial out and receive calls via a PCI modem in this computer which is plugged into the house wiring.

The firewall and AV is Kaspersky 7.01.325. With Kaspersky shut off ("paused") I get the same result.